Show commit hash in when viewing a commit in fugitive

gistfile1.txt

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 1cc3d44..4a99b06 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -1524,7 +1524,7 @@ function! fugitive#BufReadCmd(...) abort
         if b:fugitive_display_format
           call s:ReplaceCmd([dir, 'cat-file', b:fugitive_type, rev])
         else
-          call s:ReplaceCmd([dir, 'show', '--no-color', '--pretty=format:tree%x20%T%nparent%x20%P%nauthor%x20%an%x20<%ae>%x20%ad%ncommitter%x20%cn%x20<%ce>%x20%cd%nencoding%x20%e%n%n%s%n%n%b', rev])
+          call s:ReplaceCmd([dir, 'show', '--no-color', '--pretty=format:commit%x20%H%ntree%x20%T%nparent%x20%P%nauthor%x20%an%x20<%ae>%x20%ad%ncommitter%x20%cn%x20<%ce>%x20%cd%nencoding%x20%e%n%n%s%n%n%b', rev])
           keepjumps call search('^parent ')
           if getline('.') ==# 'parent '
             silent keepjumps delete_